CN106985512B - A kind of ink control method and device of printed matter - Google Patents
A kind of ink control method and device of printed matter Download PDFInfo
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- CN106985512B CN106985512B CN201710213803.9A CN201710213803A CN106985512B CN 106985512 B CN106985512 B CN 106985512B CN 201710213803 A CN201710213803 A CN 201710213803A CN 106985512 B CN106985512 B CN 106985512B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/02—Ducts, containers, supply or metering devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
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Abstract
This application involves a kind of ink control method and device of printed matter, wherein the described method includes: obtaining the print sample of preset quantity；Wherein, the print sample is determined according to printing pressure, printing ink type, paper selection amount and inking amount；Measure and record the chromatic value and density value of the print sample；The opening relationships model between the chromatic value and density value that measurement obtains, and calculate the optimum density value based on minimum color difference；According to the optimum density value, at least one candidate density value is determined in density value critical field, and calculates the derivative value of the corresponding color difference function of each candidate's density value；According to the derivative value for the color difference function being calculated, current quantity of ink is increased or reduced.Technical solution provided by the present application can accurately judge it is currently to need to increase or reduce quantity of ink, to improve the printing quality of printed matter and save the cost in printing process.
Description
Technical field
This application involves printing quality control technical field, in particular to the ink control method and dress of a kind of printed matter
It sets.
Background technique
During practical print production, control inking amount is the primary hand of machine operations personnel control printed matter color difference
Section.
Currently, operator is mostly by virtue of experience to control come the inking amount to printed matter.However, once encountering print
Refreshing product, or when encountering new operation instrument, operator usually can not accurately judge that the increase inking amount still subtracts
Few inking amount, to be unable to reach good printing effect.In this case, it will usually the waste of paper, ink is caused, so as to cause
Printing cost improves, and production efficiency reduces.
Summary of the invention
A kind of ink control method and device for being designed to provide printed matter of the application can accurately judge current
It is to need to increase or reduce quantity of ink, to improve the printing quality of printed matter and save the cost in printing process.
To achieve the above object, on the one hand the application provides the ink control method of a kind of printed matter, the method packet
It includes: obtaining the print sample of preset quantity；Wherein, the print sample is selected according to printing pressure, printing ink type, paper
Amount and inking amount determine；Measure and record the chromatic value and density value of the print sample；In the obtained chromatic value of measurement and
Opening relationships model between density value, and calculate the optimum density value based on minimum color difference；According to the optimum density value, close
At least one candidate density value is determined in angle value critical field, and calculates the corresponding color difference function of each candidate's density value
Derivative value；According to the derivative value for the color difference function being calculated, current quantity of ink is increased or reduced.
Further, the parameters of the print sample are as described below: printing pressure is between 200~350N；Printing
Ink type is four coloring agent painting plate ink Y, M, C, BK；Paper selection amount is 157~250g/m2Art paper；Inking amount range
For 0.005~0.025g；The preset quantity is 10~30.
Further, the chromatic value and density value for measuring and recording the print sample include: by the print sample of printing
Place two days or more, to ensure that the print sample is dry；10~30 surveys are chosen on the print sample with colorimeter
Point is measured, the distance between adjacent two o'clock measures Lab chromatic value between 5~10cm, and obtains the average value of chromatic value, will
Chromatic value of the average value of the chromatic value as the print sample；10~30 are chosen on the print sample with densitometer
A measurement point, the distance between adjacent two o'clock measure the density value of primary colors on the print sample between 5~10cm.
Further, opening relationships model according to the following equation:
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) indicates that the chromatic value in the channel L, y (a) indicate that the chromatic value in the channel a, y (b) indicate the coloration in the channel b
Value；ki, mi, PiIt is fitting coefficient, wherein the integer that i is 1 to n；X indicates density value.
Further, calculating the optimum density value based on minimum color difference includes:
The relationship between density value and color difference is determined according to the following equation:
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E indicates color difference function, y (L1) and y (L2) respectively indicate two chromatic values in the channel L, y (a1) and y
(a2) respectively indicate two chromatic values in the channel a, y (b1) and y (b2) respectively indicate two chromatic values in the channel b；
The derivative value differentiated to above-mentioned color difference function, and calculate color difference function corresponding density value when being 0, and will calculate
Obtained density value is as the optimum density value.
Further, the derivative value for calculating the corresponding color difference function of each candidate density value includes:
Each candidate density value is substituted into the derivative of the color difference function, and using calculated result as each described
The derivative value of the corresponding color difference function of candidate density value.
Further, according to the derivative value for the color difference function being calculated, current quantity of ink is increased or is subtracted
Include: less
When the derivative value for the color difference function being calculated is greater than 0, current quantity of ink is reduced；
When the derivative value for the color difference function being calculated is less than 0, current quantity of ink is increased.
The application also provides a kind of ink control apparatus of printed matter, and described device includes: print sample acquiring unit, uses
In the print sample for obtaining preset quantity；Wherein, the print sample is selected according to printing pressure, printing ink type, paper
Amount and inking amount determine；Colorimetric density information measurement unit, for measuring and recording the chromatic value of the print sample and close
Angle value；Optimum density value computing unit for the opening relationships model between the chromatic value and density value that measurement obtains, and calculates
Optimum density value based on minimum color difference；Derivative value computing unit is used for according to the optimum density value, in density value standard model
At least one candidate density value of interior determination is enclosed, and calculates the derivative value of the corresponding color difference function of each candidate's density value；Oil
Ink amount operating unit is increased or is subtracted to current quantity of ink for the derivative value according to the color difference function being calculated
It is few.
Further, optimum density value computing unit opening relationships model according to the following equation:
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) indicates that the chromatic value in the channel L, y (a) indicate that the chromatic value in the channel a, y (b) indicate the coloration in the channel b
Value；ki, mi, PiIt is fitting coefficient, wherein the integer that i is 1 to n；X indicates density value.
Further, the optimum density value computing unit includes:
Color difference function determining module, for determining the relationship between density value and color difference according to the following equation:
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E indicates color difference function, y (L1) and y (L2) respectively indicate two chromatic values in the channel L, y (a1) and y
(a2) respectively indicate two chromatic values in the channel a, y (b1) and y (b2) respectively indicate two chromatic values in the channel b；
Extreme value determining module for differentiating to above-mentioned color difference function, and calculates corresponding when the derivative value of color difference function is 0
Density value, and using the density value being calculated as the optimum density value.
Therefore the application determines the density of printed matter based on minimum color difference, establishes the matching relationship of coloration and density,
By analysing method scientifically, the corresponding optimum density value of printed matter minimum color difference is found out, and equation model is applied into practical life
In production, print quality can be improved, reduce printing process, to reach save the cost, improve profit, improve the effect of quality
Fruit.
Detailed description of the invention
Fig. 1 is the flow chart of the ink control method of printed matter in the application；
Fig. 2 is the structural schematic diagram of the ink control apparatus of printed matter in the application.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in mode is applied, the technical solution in the application embodiment is clearly and completely described, it is clear that described
Embodiment is only a part of embodiment of the application, rather than whole embodiments.Based on the embodiment party in the application
Formula, all other embodiment obtained by those of ordinary skill in the art without making creative efforts, is all answered
When the range for belonging to the application protection.
Referring to Fig. 1, the application embodiment provides a kind of ink control method of printed matter, which comprises
S1: the print sample of preset quantity is obtained；Wherein, the print sample according to printing pressure, printing ink type,
Paper selection amount and inking amount determine；
S2: the chromatic value and density value of the print sample are measured and recorded；
S3: the opening relationships model between the chromatic value and density value that measurement obtains, and calculate based on minimum color difference most
Good density value；
S4: according to the optimum density value, at least one candidate density value is determined in density value critical field, and calculate
The derivative value of the corresponding color difference function of each candidate density value；
S5: according to the derivative value for the color difference function being calculated, current quantity of ink is increased or is reduced.
In the present embodiment, the parameters of the print sample are as described below:
Printing pressure is between 200~350N；Printing ink type is four coloring agent painting plate ink Y, M, C, BK；Paper choosing
Dosage is 157~250g/m2Art paper；Inking amount range is 0.005~0.025g；The preset quantity is 10~30.
In the present embodiment, the chromatic value and density value for measuring and recording the print sample include:
The print sample of printing is placed two days or more, to ensure that the print sample is dry；
Choose 10~30 measurement points on the print sample with colorimeter, the distance between adjacent two o'clock 5~
Between 10cm, Lab chromatic value is measured, and obtain the average value of chromatic value, using the average value of the chromatic value as the print
The chromatic value of brush specimen page；
Choose 10~30 measurement points on the print sample with densitometer, the distance between adjacent two o'clock 5~
Between 10cm, the density value of primary colors on the print sample is measured.
In the present embodiment, opening relationships model according to the following equation:
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) indicates that the chromatic value in the channel L, y (a) indicate that the chromatic value in the channel a, y (b) indicate the coloration in the channel b
Value；ki, mi, PiIt is fitting coefficient, wherein the integer that i is 1 to n；X indicates density value.
In the present embodiment, calculating the optimum density value based on minimum color difference includes:
The relationship between density value and color difference is determined according to the following equation:
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E indicates color difference function, y (L1) and y (L2) respectively indicate two chromatic values in the channel L, y (a1) and y
(a2) respectively indicate two chromatic values in the channel a, y (b1) and y (b2) respectively indicate two chromatic values in the channel b；
The derivative value differentiated to above-mentioned color difference function, and calculate color difference function corresponding density value when being 0, and will calculate
Obtained density value is as the optimum density value.
In the present embodiment, the derivative value for calculating the corresponding color difference function of each candidate density value includes:
Each candidate density value is substituted into the derivative of the color difference function, and using calculated result as each described
The derivative value of the corresponding color difference function of candidate density value.
In the present embodiment, according to the derivative value for the color difference function being calculated, current quantity of ink is increased
Or it reduces and includes:
When the derivative value for the color difference function being calculated is greater than 0, current quantity of ink is reduced；
When the derivative value for the color difference function being calculated is less than 0, current quantity of ink is increased.
For example bright below:
(1) choose printability instrument printing pressure in 250N, selection hectographic printing C ink, with quantification of 157g/m2Copperplate
Paper is cut into 20cm*19cm size；Inking amount is in 0.0065g~0.0214g；Printing specimen page 10 is opened.
(2) placing the specimen page of printing ensures that specimen page is dry for 3 days.10 measurement points, point are chosen on specimen page with colorimeter
The distance between 7cm, measure chromatic value Lab, and obtain the average value of chromatic value.10 are chosen with densitometer again
Measurement point.The distance of measurement point measures the color density value of primary colors in 7cm.Finally data record is got off as shown in table 1.
The chromatic value and density value of the test specimen page of table 1
Based on data in table 1, the relation function between matlab fit Density value and chromatic value can be used.Density value is quasi-
Argument of function x is closed, chromatic value L, a, b are respectively dependent variable y (L), and y (a), y (b) establish fitting function using matlab
Relationship carries out the fitting of polynomial function n times side, obtains quadratic fit function and meets printing engineering needs,
Y (L)=0.3458x2-14.742x+75.135
Y (a)=8.2874x2-19.111x-14.638
Y (b)=6.5514x2-31.956x-13.697
The three chromatic value equations come will be simulated to be brought into CIE1976lab colour difference formula, it may be assumed that
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Calculate the functional relation of color difference and density value are as follows:
△E2=111.72x4-745.67x3+2463.98x2-3768.59x+2223.59
Equation: 2 △ E=446.88x is obtained to function derivation3-2237.01x2+4927.96x-3768.59.△ E=0 is enabled,
Extreme value is found out, when obtaining C color minimum color difference, best field density is 1.42.Meet the field density critical field of national standard cyan C
Between 1.4~1.5, then three groups of candidate's density values can be selected, respectively 1.40,1.42,1.43.
Above three candidate's density value can be brought into the equation after derivation, so that each candidate density be calculated
It is worth the derivative value of corresponding color difference function.Specifically, the derivative value being calculated can be as shown in table 2:
The candidate density value of table 2 and derivative value corresponding relationship
According to table 2, when density value is 1.40 and 1.42, in order to reach minimum color difference, machine operations are needed at this time
Increase ink amount；If density value is 1.43, at this time in order to reach minimum color difference, machine operations need to reduce ink amount at this time.
Referring to Fig. 2, the application also provides a kind of ink control apparatus of printed matter, described device includes:
Print sample acquiring unit 100, for obtaining the print sample of preset quantity；Wherein, the print sample according to
Printing pressure, printing ink type, paper selection amount and inking amount determine；
Colorimetric density information measurement unit 200, for measuring and recording the chromatic value and density value of the print sample；
Optimum density value computing unit 300, for measuring opening relationships model between obtained chromatic value and density value,
And calculate the optimum density value based on minimum color difference；
Derivative value computing unit 400, for determining at least one in density value critical field according to the optimum density value
A candidate's density value, and calculate the derivative value of the corresponding color difference function of each candidate's density value；
Quantity of ink operating unit 500, for according to the derivative value of color difference function being calculated, to current quantity of ink into
Row increases or reduces.
In the present embodiment, optimum density value computing unit opening relationships model according to the following equation:
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) indicates that the chromatic value in the channel L, y (a) indicate that the chromatic value in the channel a, y (b) indicate the coloration in the channel b
Value；ki, mi, PiIt is fitting coefficient, wherein the integer that i is 1 to n；X indicates density value.
In the present embodiment, the optimum density value computing unit includes:
Color difference function determining module, for determining the relationship between density value and color difference according to the following equation:
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E indicates color difference function, y (L1) and y (L2) respectively indicate two chromatic values in the channel L, y (a1) and y
(a2) respectively indicate two chromatic values in the channel a, y (b1) and y (b2) respectively indicate two chromatic values in the channel b；
Extreme value determining module for differentiating to above-mentioned color difference function, and calculates corresponding when the derivative value of color difference function is 0
Density value, and using the density value being calculated as the optimum density value.
Therefore the application determines the density of printed matter based on minimum color difference, establishes the matching relationship of coloration and density,
By analysing method scientifically, the corresponding optimum density value of printed matter minimum color difference is found out, and equation model is applied into practical life
In production, print quality can be improved, reduce printing process, to reach save the cost, improve profit, improve the effect of quality
Fruit.
Those skilled in the art are supplied to the purpose described to the description of the various embodiments of the application above.It is not
It is intended to exhaustion or be not intended to and limit the invention to single disclosed embodiment.As described above, the application's is various
Substitution and variation will be apparent for above-mentioned technology one of ordinary skill in the art.Therefore, although specifically begging for
Some alternative embodiments are discussed, but other embodiment will be apparent or those skilled in the art are opposite
It is easy to obtain.The application is intended to include all substitutions of the invention discussed herein, modification and variation, and falls in
Other embodiment in the spirit and scope of above-mentioned application.
Claims (9)
1. a kind of ink control method of printed matter, which is characterized in that the described method includes:
Obtain the print sample of preset quantity；Wherein, the print sample is selected according to printing pressure, printing ink type, paper
Dosage and inking amount determine；
Measure and record the chromatic value and density value of the print sample；
The opening relationships model between the chromatic value and density value that measurement obtains, and calculate the optimum density based on minimum color difference
Value；
According to the optimum density value, at least one candidate density value is determined in density value critical field, and calculate each institute
State the derivative value of the corresponding color difference function of candidate density value；
According to the derivative value for the color difference function being calculated, current quantity of ink is increased or reduced；And
According to the derivative value for the color difference function being calculated, current quantity of ink is increased or reduced is specifically included:
When the derivative value for the color difference function being calculated is greater than 0, current quantity of ink is reduced；
When the derivative value for the color difference function being calculated is less than 0, current quantity of ink is increased.
2. the ink control method of printed matter according to claim 1, which is characterized in that every ginseng of the print sample
Number is as described below:
Printing pressure is between 200~350N；Printing ink type is four coloring agent painting plate ink Y, M, C, BK；Paper selection amount
For 157~250g/m2Art paper；Inking amount range is 0.005~0.025g；The preset quantity is 10~30.
3. the ink control method of printed matter according to claim 1, which is characterized in that measure and record the printing sample
Chromatic value and density value include:
The print sample of printing is placed two days or more, to ensure that the print sample is dry；
10~30 measurement points are chosen on the print sample with colorimeter, the distance between adjacent two o'clock is in 5~10cm
Between, Lab chromatic value is measured, and obtain the average value of chromatic value, using the average value of the chromatic value as the printing sample
The chromatic value opened；
10~30 measurement points are chosen on the print sample with densitometer, the distance between adjacent two o'clock is in 5~10cm
Between, measure the density value of primary colors on the print sample.
4. the ink control method of printed matter according to claim 1, which is characterized in that opening relationships according to the following equation
Model:
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) indicates that the chromatic value in the channel L, y (a) indicate that the chromatic value in the channel a, y (b) indicate the chromatic value in the channel b；ki,
mi, PiIt is fitting coefficient, wherein the integer that i is 1 to n；X indicates density value.
5. the ink control method of printed matter according to claim 4, which is characterized in that calculate based on minimum color difference most
Good density value includes:
The relationship between density value and color difference is determined according to the following equation:
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E indicates color difference function, y (L1) and y (L2) respectively indicate two chromatic values in the channel L, y (a1) and y (a2) respectively
Indicate two chromatic values in the channel a, y (b1) and y (b2) respectively indicate two chromatic values in the channel b；
To the function △ E of color difference and density value2The derivative value differentiated, and calculate color difference function corresponding density value when being 0, and
Using the density value being calculated as the optimum density value.
6. the ink control method of printed matter according to claim 1 or 5, which is characterized in that calculate each candidate
The derivative value of the corresponding color difference function of density value includes:
Each candidate density value is substituted into the derivative of the color difference function, and using calculated result as each candidate
The derivative value of the corresponding color difference function of density value.
7. a kind of ink control apparatus of printed matter, which is characterized in that described device includes:
Print sample acquiring unit, for obtaining the print sample of preset quantity；Wherein, the print sample is pressed according to printing
Power, printing ink type, paper selection amount and inking amount determine；
Colorimetric density information measurement unit, for measuring and recording the chromatic value and density value of the print sample；
Optimum density value computing unit for the opening relationships model between the chromatic value and density value that measurement obtains, and calculates
Optimum density value based on minimum color difference；
Derivative value computing unit, for determining that at least one is candidate in density value critical field according to the optimum density value
Density value, and calculate the derivative value of the corresponding color difference function of each candidate's density value；
Quantity of ink operating unit increases current quantity of ink for the derivative value according to the color difference function being calculated
Or it reduces；And
The quantity of ink operating unit is specifically used for: when the derivative value for the color difference function being calculated is greater than 0, by current oil
Ink amount is reduced；When the derivative value for the color difference function being calculated is less than 0, current quantity of ink is increased.
8. the ink control apparatus of printed matter according to claim 7, which is characterized in that the optimum density value calculates single
First opening relationships model according to the following equation:
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) indicates that the chromatic value in the channel L, y (a) indicate that the chromatic value in the channel a, y (b) indicate the chromatic value in the channel b；ki,
mi, PiIt is fitting coefficient, wherein the integer that i is 1 to n；X indicates density value.
9. the ink control apparatus of printed matter according to claim 8, which is characterized in that the optimum density value calculates single
Member includes:
Color difference function determining module, for determining the relationship between density value and color difference according to the following equation:
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E indicates color difference function, y (L1) and y (L2) respectively indicate two chromatic values in the channel L, y (a1) and y (a2) respectively
Indicate two chromatic values in the channel a, y (b1) and y (b2) respectively indicate two chromatic values in the channel b；
Extreme value determining module, for the function △ E to color difference and density value2The derivative value differentiated, and calculate color difference function is 0
When corresponding density value, and using the density value being calculated as the optimum density value.
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| CN109706759A (en) * | 2018-12-29 | 2019-05-03 | 杭州智数创联科技有限公司 | A kind of digit printing single channel ink amount method for limiting based on gamut area |
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| JP4276046B2 (en) * | 2003-10-30 | 2009-06-10 | 株式会社小森コーポレーション | Method and apparatus for adjusting ink supply amount of printing press |
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